| 2012 NL Leaders | |||||||||||||
| Name | Age | Team | G | IP | TBF | BB% | K% | BABIP | LOB% | GB% | HR/Air | ERA | FIP |
| John Ely | LA Dodgers | 2 | 2.67 | 19 | 21.1% | 15.8% | .750 | 45% | 55% | 0% | 20.22 | 6.50 | |
| Justin Wilson | 25 | Pittsburgh | 8 | 4.67 | 26 | 11.5% | 26.9% | .667 | 92% | 19% | 0% | 1.93 | 2.06 |
| Joseph Paterson | Arizona | 6 | 2.67 | 26 | 11.5% | 0.0% | .619 | 46% | 57% | 20% | 37.08 | 16.24 | |
| Francisco Cordero | 37 | Houston | 6 | 5.00 | 32 | 12.5% | 15.6% | .579 | 46% | 41% | 16% | 19.80 | 9.33 |
| Vinnie Chulk | 34 | Milwaukee | 7 | 9.00 | 48 | 8.3% | 20.8% | .515 | 52% | 26% | 0% | 10.00 | 2.24 |
| Brian Wilson | 30 | San Francisco | 2 | 2.00 | 12 | 16.7% | 16.7% | .500 | 67% | 29% | 0% | 9.00 | 4.13 |
| Brad Lidge | 36 | Washington | 11 | 9.33 | 51 | 21.6% | 19.6% | .478 | 60% | 48% | 8% | 9.65 | 5.91 |
| Maikel Cleto | 23 | St. Louis | 9 | 9.00 | 41 | 4.9% | 36.6% | .474 | 87% | 32% | 26% | 7.00 | 6.57 |
| Rick Vanden Hurk | Pittsburgh | 4 | 2.67 | 16 | 6.3% | 18.8% | .455 | 43% | 55% | 0% | 13.48 | 3.13 | |
| Enerio Del Rosario | 27 | Houston | 19 | 19.00 | 97 | 7.2% | 11.3% | .446 | 53% | 39% | 2% | 9.00 | 4.07 |
| Yusmeiro Petit | 28 | San Francisco | 1 | 4.67 | 22 | 18.2% | 4.5% | .438 | 82% | 35% | 0% | 3.85 | 5.27 |
| Esmil Rogers | 27 | Colorado | 23 | 25.67 | 131 | 13.7% | 22.1% | .436 | 62% | 49% | 5% | 8.06 | 4.22 |
| Charles Fick | St. Louis | 2 | 1.67 | 9 | 11.1% | 0.0% | .429 | 75% | 0% | 0% | 5.39 | 4.92 | |
| Zach Putnam | 25 | Colorado | 2 | 2.00 | 9 | 11.1% | 0.0% | .429 | 100% | 38% | 0% | 0.00 | 4.63 |
| Kenneth Herndon | 27 | Philadelphia | 5 | 7.67 | 33 | 3.0% | 24.2% | .429 | 73% | 46% | 8% | 4.69 | 3.13 |
| Todd Redmond | 27 | Cincinnati | 1 | 3.33 | 22 | 22.7% | 9.1% | .429 | 75% | 33% | 10% | 10.81 | 10.33 |
| William Harris | 28 | Colorado | 20 | 17.67 | 89 | 6.7% | 21.3% | .429 | 54% | 32% | 7% | 8.15 | 4.37 |
| David Carpenter | 27 | Houston | 30 | 29.67 | 143 | 9.8% | 18.9% | .424 | 71% | 42% | 7% | 6.07 | 4.58 |
| Jonathan Sanchez | 30 | Colorado | 3 | 11.33 | 57 | 15.8% | 15.8% | .424 | 60% | 34% | 12% | 9.53 | 7.36 |
| Blake Parker | 27 | Chi Cubs | 7 | 6.00 | 32 | 15.6% | 18.8% | .412 | 74% | 40% | 25% | 6.00 | 10.13 |
| Cory Burns | San Diego | 17 | 18.00 | 92 | 10.9% | 19.6% | .410 | 73% | 57% | 4% | 5.50 | 3.68 | |
| Mike MacDougal | 35 | LA Dodgers | 7 | 5.67 | 32 | 18.8% | 12.5% | .409 | 67% | 37% | 0% | 7.94 | 4.89 |
| Daniel Otero | San Francisco | 12 | 12.33 | 57 | 3.5% | 14.0% | .409 | 50% | 71% | 0% | 5.84 | 2.80 | |
| Elvin Ramirez | 25 | NY Mets | 20 | 21.33 | 102 | 19.6% | 21.6% | .404 | 73% | 45% | 3% | 5.49 | 4.49 |
| Tim Stauffer | 30 | San Diego | 1 | 5.00 | 24 | 12.5% | 20.8% | .400 | 70% | 60% | 16% | 5.40 | 5.53 |
| Jonathan Albaladejo | 30 | Arizona | 3 | 3.00 | 15 | 0.0% | 13.3% | .400 | 65% | 25% | 11% | 9.00 | 7.13 |
| Lendy Castillo | 23 | Chi Cubs | 13 | 16.00 | 88 | 13.6% | 14.8% | .400 | 64% | 36% | 5% | 7.88 | 5.94 |
| Guillermo Mota | 39 | San Francisco | 26 | 20.67 | 91 | 8.8% | 26.4% | .396 | 70% | 40% | 9% | 5.22 | 4.14 |
| Chien-Ming Wang | 32 | Washington | 10 | 32.33 | 158 | 9.5% | 9.5% | .395 | 72% | 51% | 8% | 6.68 | 5.88 |
| Juan Nicasio | Colorado | 11 | 58.00 | 257 | 8.6% | 21.0% | .387 | 68% | 38% | 6% | 5.28 | 4.02 | |
